ParityGroups

When you create a RAID 50 or RAID 60
configuration, you must also set the number of parity groups.

You can use any integer value greater than 1
for this setting, with the restriction that the total number of
physical drives in the array must be exactly divisible by the
number of parity groups.

The maximum number of parity groups possible
for a particular number of physical drives is the total number of
drives divided by the minimum number of drives necessary for that
RAID level (three for RAID 50, four for RAID 60).